Slump retention in cementitious compositions

C - Chemistry – Metallurgy – 08 – K

Patent

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C08K 3/00 (2006.01)

Patent

CA 2625836

The present invention relates to dispersants such as superplasticizers for hydratable cementitious compositions, and more particularly to methods for achieving variable degrees of longer slump life in concrete and mortar without loss of stability. This is achieved by using two admixture systems. The first admixture composition has multi-components for achieving initial- slump- enhancement, later-slump-retention, and limiting initial slump. The second admixture composition has the later-slump-enhancing component. Alternatively, conventional water reducers or superplasticizers can be employed initially, followed by the later-slump-enhancing admixture composition.

L'invention concerne des dispersants tels que des superplastifiants destinés à des compositions à base de ciment hydratable, et plus particulièrement des procédés destinés à réaliser des degrés variables de maintien de l'ouvrabilité prolongée du béton et du mortier sans perte de stabilité. Ceci est réalisé au moyen de deux systèmes de mélange. La première composition mélangée contient des composants multiples destinés à réaliser une amélioration par rapport à l'affaissement initial, une retenue de l'affaissement ultérieur, et une limitation de l'affaissement initial. La seconde composition de mélange comprend le composant améliorant l'affaissement ultérieur. Dans un autre mode de réalisation, des superplastifiants ou réducteurs d'eau classique peuvent être utilisés initialement, puis suivis par la composition de mélange améliorant l'affaissement ultérieur.

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